<!DOCTYPE html>
  <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <a href="https://www.163.com/" target="showframe">163</a><br>
    <a href="http://www.taobao.com" target="showframe">天猫</a><br>
    <a href="https://www.sina.com.cn" target="showframe">新浪</a>
</body>
</html>
